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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
**     the names of its contributors may be used to endorse or promote
**     products derived from this software without specific prior written
**     permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/

#include "xmlsyntaxhighlighter.h"

XmlSyntaxHighlighter::XmlSyntaxHighlighter(QTextDocument *parent)
    : QSyntaxHighlighter(parent)
{
    HighlightingRule rule;

    // tag format
    tagFormat.setForeground(Qt::darkBlue);
    tagFormat.setFontWeight(QFont::Bold);
    rule.pattern = QRegExp("(<[a-zA-Z:]+\\b|<\\?[a-zA-Z:]+\\b|\\?>|>|/>|</[a-zA-Z:]+>)");
    rule.format = tagFormat;
    highlightingRules.append(rule);

    // attribute format
    attributeFormat.setForeground(Qt::darkGreen);
    rule.pattern = QRegExp("[a-zA-Z:]+=");
    rule.format = attributeFormat;
    highlightingRules.append(rule);

    // attribute content format
    attributeContentFormat.setForeground(Qt::red);
    rule.pattern = QRegExp("(\"[^\"]*\"|'[^']*')");
    rule.format = attributeContentFormat;
    highlightingRules.append(rule);

    commentFormat.setForeground(Qt::lightGray);
    commentFormat.setFontItalic(true);

    commentStartExpression = QRegExp("<!--");
    commentEndExpression = QRegExp("-->");
}

void XmlSyntaxHighlighter::highlightBlock(const QString &text)
{
     foreach (const HighlightingRule &rule, highlightingRules) {
         QRegExp expression(rule.pattern);
         int index = text.indexOf(expression);
         while (index >= 0) {
             int length = expression.matchedLength();
             setFormat(index, length, rule.format);
             index = text.indexOf(expression, index + length);
         }
     }
     setCurrentBlockState(0);

     int startIndex = 0;
     if (previousBlockState() != 1)
         startIndex = text.indexOf(commentStartExpression);

     while (startIndex >= 0) {
         int endIndex = text.indexOf(commentEndExpression, startIndex);
         int commentLength;
         if (endIndex == -1) {
             setCurrentBlockState(1);
             commentLength = text.length() - startIndex;
         } else {
             commentLength = endIndex - startIndex
                             + commentEndExpression.matchedLength();
         }
         setFormat(startIndex, commentLength, commentFormat);
         startIndex = text.indexOf(commentStartExpression,
                                                 startIndex + commentLength);
     }
}